TPi October 2009

Tube Extruded

A new solution for production of multilayer nylon pipe

necessary it is manufactured by using materials with a very high degree of resistance to corrosion, such as Inconel or Hastelloy. Based on the particular geometry, the thickness spreading of the single layers is not so much influenced by the variation of the viscosity of the polymer in transit. A head is also available for the production of multilayer corrugated pipes. With this model it is possible to centre the pipe wall thickness by acting on the central mandrel, by keeping the female die centred with the corrugators moulds. New generation sizer: The reduced friction of the extruded material into the sizer, obtained thanks to recently developed technologies, has allowed a reduction in the stress on the pipe and enabled extrusion speeds of 60-70m/ min, in the case of the five layers. For very small pipes, openable sizers are used to facilitate the plant starting operations. Vacuum calibration trough: In consideration of the high calibration speed, a longer vacuum section allows

Single screw extruders: In order to obtain perfect control of the metric weight of the pipe and a constant distribution of the thickness in the different layers, it is necessary to use gravimetric weight control systems. In the case of fluoropolymers, the alloys used for the construction of the key- parts of the extruder are important, in particular the plasticising unit where, in order to achieve high resistance to abrasion and corrosion, some alloys with a high percentage of nickel are used to manufacture barrels and screws. The new geometries of the grooved feeding bushes (when necessary also cooled by water), which couple to new generation plasticising screws, achieve high outputs by keeping the melt qualities unchanged and reducing the energetic consumptions (kW/kg).

AMUT SpA, established in 1958, manufactures extrusion plants for processing thermoplastic materials. Within the automotive industry and in respect of Euro II/V standards, as regards small nylon pipes to convey fuels or hydraulic oils, it has been necessary to introduce multilayer products (up to five layers) with barrier layers in EVOH, PBT, fluoropolymers and functional layers, such as nylon 12 conductive. These solutions provide properties that cannot be achieved by a single layer pipe, including good flexibility impact strength and resistance to low temperatures, stress and cracking resistance, abrasion resistance, endurance strength, water absorption low factor, dimensional strength at the change of environmental humidity conditions, and permeability resistance of hydrocarbons and oils, both hydraulic and lubricating.

Coextrusion head: Designed according to the technology of flat spirals, when

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July 2009

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Tube Products International October 2009

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